Each LEA Test comes with a detailed instruction. In this section there are short
descriptions of the main characteristics of the tests. The complete instructions can
be found in the Instructions Section.

The LEA SYMBOLS® were designed in 1976 (Hyvärinen et al. 1980) because of the
lack of child friendly vision tests. Over the years they have been modified several
times. The history of these optotypes is
therefor longer than you might think.